[GitHub] seojangho commented on a change in pull request #56: [NEMO-16] Implement collection of data from executor to client

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seojangho commented on a change in pull request #56: [NEMO-16] Implement collection of data from executor to client
URL: https://github.com/apache/incubator-nemo/pull/56#discussion_r198720704
 
 

 ##########
 File path: common/src/main/java/edu/snu/nemo/common/ContextImpl.java
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 @@ -18,23 +18,36 @@
 import edu.snu.nemo.common.ir.vertex.transform.Transform;
 
 import java.util.Map;
+import java.util.Optional;
 
 /**
  * Transform Context Implementation.
  */
 public final class ContextImpl implements Transform.Context {
   private final Map sideInputs;
+  private Optional<String> data;
 
 Review comment:
   How about letting data `Nullable` and returning `Optional.ofNullable(data)` in `getSerializedData`?

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